Link-motion block.



UNITED STATES -PATENT OFFICE.

OLIVER D. HOLT, OF BRAMAN, OKLAHOMA TERRITORY.

LIN K-MOTlON BLOCK.

SPECIFICATION forming part of Letters Patent No. 703,924, dated July 1,1902.

l Application tiled February 21, 1902. Serial No. 95,106. (No model.)

To all whom, t nuty concern:`

Be it known that I, OLIVER D. HOLT, a citizen of the United States,residing at Braman, in the county of Kay and Territory of Oklahoma, haveinvented a new and useful Link- Motion Block,of which the following is aspecification. Y

My invention relates to `"certain improvements in the constructionof-link-blocks and devices of similar character in the formof guidedblocks or engine cross-heads'which are subjected to sliding friction.

The principal object of the invention is to construct a block which maybe adjusted to compensate for wear either on the block or on the guidesin which it is held.

With this and other objects in view the invention consists in the novelconstruction and arrangement of parts hereinafter. described,illustrated in the accompanying drawings,

and particularly pointed out inA the claim hereto appended. i

ln the drawings, Figure 1 is a sectional elevation of a link-blockconstructed in accordance with myinvention. Fig. 2 is a sectional planview of the same on the line 2 2 of Fig. 1. Fig. 3 is a detailperspectiveview of the adjustable portions of the'block detached.

Similar numerals of reference are employed to designate correspondingparts throughout the various gures of the drawings.

5 designates a block ofV a size. and shape suitable for engagement witha link and provided with a central opening 6 for the reception of thepin or bolt by which it is connected to the lower rocker-arm of thevalvelgear.

As a rule these blocks are formed of a single piece of metal machined tothe proper shape and with no provision for adjustment in case of wear.In locomotive-work, `where the link is shifted frequently in thestopping or starting of an engine orlin changing the speed, there isconsiderable wear on both the link and the block,`and considerable workand expense are involved in substitutinga new block for one wornawayandloose from constant work.

In carrying out my invention I form in each side of the block arectangular recess 7, in which are placed a longitudinally-movablewedge-block 8 and a laterally-movable wearing-block 9, the latter beingof such size as to fit snugly in the outer portion of the recess and`forming the wearing-surface in contact with the blades of the link. Atthe upper end'of the block 9 is an inwardly-projecting-anoutwardm'ovement of the wearing-block.

The wedge-block may, if necessary, terminate below the lug 10 of thewearing-block; but it is preferred to extend the contact-surfacesbetween the block, this being accomplished by providing a recess 19 inthe upper portion of the wedge-block for the passage of the lug 10. Theinner wall of the recess 7 and the outer line or contact-face of thewearing-block are parallel with each other, so that any longitudinalmovement of the wedge-block will result in a movement ot' thewearing-block to precisely the same extent at all points. In adjustingthe device to compensate for wear, the set-screw 1l is loosened and thenut 13 is turned, causing a longitudinal movement of the wedge-block andan outward movement of the wearing-block. When the wearingblock is movedto the desired position, the setscrew 11 is tightened up and securelylocks it in place. By providing the adjusting devices on each side ofthe block the connecting-pin between the block and the rocker-arm of thevalve-gear maybe maintained in any position desired, or it may beadjusted to one side or the other to effect a similar movement of thevalve.

While the construction .herein described, and illustrated in theaccompanying drawings,

is the preferred form of the device, it is ob- IOO other sliding blockshaving fixed guides without departing from the spirit or sacrificing anyof the advantages of my invention.

Having thus described my invention, what I claim is- The combination ofthe link-block having a central pivot-opening and provided at itsopposite sides with recesses 7,lateral1y-Inovable wearing-blocks 9having flat bearing-faces projecting slightly beyond the mouth of therecesses, said bearing-blocks being of a length and Width approximatelyequal to the length and width of the-recesses and each being provided atits narrower end with an inwardlyprojecting lug l0, set-screws llcarried by the link-block and adapted to engage with said lugs,Wedge-blocks 8 situated between the inclined faces of the Wearing-blocksand the inner walls of the recesses, said Wedge-blocks each beingprovided with a recess 19 for the reception of the lugs 10, threadedstems l2 forming part of Wedge-blocks and extending out throughguiding-openings in the lower pori OLIVER D. lI-IOL'I.

Witnesses:

W. A. STOUGH, W. E. HOLMES.

